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pkt_sched: fq: qdisc dismantle fixes

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fq_reset() should drops all packets in queue, including
throttled flows.

This patch moves code from fq_destroy() to fq_reset()
to do the cleaning.

fq_change() must stop calling fq_dequeue() if all remaining
packets are from throttled flows.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-09-27 14:20:01 -07:00 committed by David S. Miller
parent b86783587b
commit 8d34ce10c5
1 changed files with 37 additions and 20 deletions
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57
net/sched/sch_fq.c
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@ -285,7 +285,7 @@ static struct fq_flow *fq_classify(struct sk_buff *skb, struct fq_sched_data *q)
/* remove one skb from head of flow queue */
static struct sk_buff *fq_dequeue_head(struct fq_flow *flow)
static struct sk_buff *fq_dequeue_head(struct Qdisc *sch, struct fq_flow *flow)
{
struct sk_buff *skb = flow->head;
@ -293,6 +293,8 @@ static struct sk_buff *fq_dequeue_head(struct fq_flow *flow)
flow->head = skb->next;
skb->next = NULL;
flow->qlen--;
sch->qstats.backlog -= qdisc_pkt_len(skb);
sch->q.qlen--;
}
return skb;
}
@ -419,7 +421,7 @@ static struct sk_buff *fq_dequeue(struct Qdisc *sch)
struct sk_buff *skb;
struct fq_flow *f;
skb = fq_dequeue_head(&q->internal);
skb = fq_dequeue_head(sch, &q->internal);
if (skb)
goto out;
fq_check_throttled(q, now);
@ -449,7 +451,7 @@ begin:
goto begin;
}
skb = fq_dequeue_head(f);
skb = fq_dequeue_head(sch, f);
if (!skb) {
head->first = f->next;
/* force a pass through old_flows to prevent starvation */
@ -490,19 +492,44 @@ begin:
}
}
out:
sch->qstats.backlog -= qdisc_pkt_len(skb);
qdisc_bstats_update(sch, skb);
sch->q.qlen--;
qdisc_unthrottled(sch);
return skb;
}
static void fq_reset(struct Qdisc *sch)
{
struct fq_sched_data *q = qdisc_priv(sch);
struct rb_root *root;
struct sk_buff *skb;
struct rb_node *p;
struct fq_flow *f;
unsigned int idx;
while ((skb = fq_dequeue(sch)) != NULL)
while ((skb = fq_dequeue_head(sch, &q->internal)) != NULL)
kfree_skb(skb);
if (!q->fq_root)
return;
for (idx = 0; idx < (1U << q->fq_trees_log); idx++) {
root = &q->fq_root[idx];
while ((p = rb_first(root)) != NULL) {
f = container_of(p, struct fq_flow, fq_node);
rb_erase(p, root);
while ((skb = fq_dequeue_head(sch, f)) != NULL)
kfree_skb(skb);
kmem_cache_free(fq_flow_cachep, f);
}
}
q->new_flows.first = NULL;
q->old_flows.first = NULL;
q->delayed = RB_ROOT;
q->flows = 0;
q->inactive_flows = 0;
q->throttled_flows = 0;
}
static void fq_rehash(struct fq_sched_data *q,
@ -645,6 +672,8 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt)
while (sch->q.qlen > sch->limit) {
struct sk_buff *skb = fq_dequeue(sch);
if (!skb)
break;
kfree_skb(skb);
drop_count++;
}
@ -657,21 +686,9 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt)
static void fq_destroy(struct Qdisc *sch)
{
struct fq_sched_data *q = qdisc_priv(sch);
struct rb_root *root;
struct rb_node *p;
unsigned int idx;
if (q->fq_root) {
for (idx = 0; idx < (1U << q->fq_trees_log); idx++) {
root = &q->fq_root[idx];
while ((p = rb_first(root)) != NULL) {
rb_erase(p, root);
kmem_cache_free(fq_flow_cachep,
container_of(p, struct fq_flow, fq_node));
}
}
kfree(q->fq_root);
}
fq_reset(sch);
kfree(q->fq_root);
qdisc_watchdog_cancel(&q->watchdog);
}